#all{border:1px solid gray;
    width: 600px;
    margin:0 auto;
}
#top {
    background: #E8E8E8;
    height: 65px;
}
/*logo的位置及大小的设置*/
#logo{
    height: 40px;
    position: absolute;
    margin:12px 0 0 465px ;
}
/**top中的两个按钮的修饰*/
#top li{
    list-style-type:none;
    cursor:pointer;
    width: 200px;
    height: 50px;
    font-size: 18px;
    font-weight: 600;
    line-height: 50px;
    text-align: center;
    background: #C8C8C8	;
}
#but1{
    position: absolute;
    margin:15px 0 0 15px ;
}
#but2{
    position: absolute;
    margin : 15px 0 0 230px ;
}

#mid{
    background: #B0B0B0;
    height: 193px;
    padding:12px 0 0 0;
}

#mid_1,#mid_2,#mid_3{width: 580px;margin:0 auto}

#mid_1,#mid_2{background: white;}

#mid_1,#mid_2{height: 130px; }

#mid_3{background: #6699CC;height: 63px;}

#but3{width: 200px;height: 40px;background: lightgreen;font-size: 24px;
    font-weight: bold;line-height:40px ;text-align: center;border:none;
    margin:12px 0 0 15px ;color:white;
}
#span1{
    margin:-30px 0 0 510px;
    background: url("../image/reset.png") no-repeat 0px 3px;
    padding:0 0 0 23px;
    cursor: pointer;
}

#span1{display: block;}

#tab1{margin:20px 0 0 20px ;position: absolute;}
#tab2{margin:20px 0 0 20px ;position: absolute;}
#tab3{margin:20px 0 0 20px ;position: absolute;}
#tab4{margin:20px 0 0 20px ;position: absolute;}
#bot{
    background: lightyellow;
    height: 195px;
}


.xian{display: block;}
.yin{display: none;}
